HR: Na južnim obroncima Medvednice, možemo naići na napušteni kamenolom Bizek. Nekad je služio kao primarni izvor sirovine (lapora) za cementaru u Podsusedu, a od kamena odavde je izgrađena i pošta u Jurišićevoj te Zagrebačka katedrala. Kad ustreba kamena za obnovu katedrale, onda se kamenolom privremeno otvori i iskapa potrebni kamen. Za svrhu transporta lapora, bio je prokopan i tunel od kamenoloma pa sve do cementare. Navodno je bio visok 3.20 m, a širok preko 2.5 m, te dug preko 2 km. Iako su nakon zatvaranja cementare i kamenoloma (a samim time prestankom komercijalne upotrebe tunela) postojali planovi da se u njemu uzgajaju gljive, i ulaz i izlaz iz tunela su zatrpani. Jedan lokalac mi je rekao da je to zato jer se tamo “svašta” događalo, ne ulazeći u detalje… 
Kad je u tunel prvi put probila voda, u istu svrhu (transporta kamena do cementare) izgrađena je ogromna žičara, čiji nosivi stupovi još postoje, i dobro su vidljivi uz cestu na putu prema kamenolomu. Sam kamenolom je zanimljiv i danas, jer se navodno u njemu vrlo lako mogu naći svakakvi fosili, i to bez nekog većeg iskapanja (dakle, ponesite čekić).
Za više detalja o ovom fascinantnom mjestu obavezno preporučam pogledati ovaj odličan video o postrojenju, u čijem prvom dijelu vidimo zgradu koju ćemo posjetiti. Također, par dobrih članaka o povijesti kamenoloma Bizek nalazimo na stranicama Nepoznatog Zagreba, Zdenko's Corner-a, te Croatia Infiltration-a.
Ovaj cache je sakriven u zgradi koja je služila kao strojarnica za žičaru. Tu postoje 3-4 kata, sa zastrašujuće velikim postrojenjima kojima se ne vidi kraja ni dna (bar sa najgornjeg nivoa, na kojem je cache i sakriven). NEMA POTREBE SILAZITI NA DONJE NIVOE!!!
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EN: On the southern slopes of Medvednica, we come across an abandoned quarry Bizek. Once served as the primary source of raw materials (marl) for a cement plant in Podsused. Stone from here was used to built a main post office building in Jurisiceva as well as the Zagreb Cathedral. When the new stone is needed for the reconstruction of the cathedral, then the quarry temporarily opens and the required stone is excavated. A tunnel has been dug from a quarry to the cement plant, for the purpose of transporting marl. Apparently, it was a 3.20 m high and 2.5 m wide, and over 2 km long. Although after the closure of cement plants and quarries (and therefore the cessation of commercial use of tunnels) there were plans to cultivate mushrooms in it, the entrance and exit of the tunnel were buried. One local told me that this was because there were "various things" happening in the tunnel, without going into details ...
When the tunnel was flooded for the first time, a huge cable railway had been built for the same purpose (transport stone to cement plant). Its supporting pillars still exist, and are well visible along the road on the way up there. Quarry itself is interesting even today, because it very easy to find all sorts of fossils, without any major excavation (so, bring a hammer).
For more details about this fascinating place I recommend to watch this excellent video about the structure, in the first part of which we see a building that we’re about to visit. Also, a couple of good articles on the history of the Bizek quarry on the pages of Unknown Zagreb, Zdenko's Corner and Croatia Infiltration (everything in croatian only, I’m afraid).
This cache is hidden in a building that served as the engine for the cable railway. There are 3-4 floors, with frightening large installations whose end or the bottom I cannot see (at least the uppermost level, where the cache is hidden). THERE IS NO NEED TO GO ON THE LOWER LEVELS!!!
